lewis



(NO Model.)

W. H. LEWIS.

PHOTOGRAPH CAMERA SHUTTER.

No. 367,986. Patented Aug. 9'. 1887.

Z' INVITES; i

ATTORNEYS.

N PETERSv Phnmmhn u har, wasm'u mmlc.

UNITED STATES PATENT OEEIeE.

\VILLIAM H. LE\VIS, OF BROOKLYN, ASSIGNOR TO E. & H. T. ANTHONY 8nCOMPANY, OF NEXV YORK, N. Y.

PHOTOGRAPH-CAMERA SHUTTER.

SPECIFICATION forming part of Letters Patent No. 367,986, dated August9, 1887.

Application filed April 30, 1886. Serial No. 200,!76]. (No model.) i

To aZZ 071/0772, it may concern.-

Be it known that I, WILLIAM H. LEwIs, of Brooklyn, in the county ofKings and State of New York, have invented a new and useful Improvementin Photographic-Camera Shut ters, of which the following is aspecification, reference being bad to the annexed drawings, forming apart thereof, in which- Figure 1 is a front elevation of my improvedcamera-shutter. Fig. 2 is a side elevation. Fig. 3 is a perspective viewshowing the rear of the camera-shutter. Fig. 4 is a detail perspectiveview of the shutter.

Similar letters of reference indicate corresponding parts in thedifferent figures of the drawings.

The object of my invention is to provide a simple, inexpensive, ande'fficient camera-shut ter which may be readily applied to anyphotographic camera, and which may be used for making either a time orinstantaneous exposure.

My invention consists in a circular shutterbody provided with anaperture at one side of the center thereof, and having a fasteningdevice for attaching it to the camera-tube, a circular shutter pivotedto the shutter-body and apertured at one side of the center, havingnotches in its edge, a lever pivoted to the shutter-body and arranged toengage one or the other of the notches of the shutter, and a pneumaticdevice for moving the shutter-engaging lever.

It also consists in the combination,with the shutter, of a levercarrying an adjustable weight and connected by a cord with the boss ofthe shutter.

It also further consists in amovable stop for limiting the motion of theshuttercngaging lever when it is desired to make a time exposure.

The body A of the shutter is provided with a circular opening, B, at oneside of the center thereof, and with an annular groove, (1, in the rearside, which is concentric with the opening B, and is designed to receivethe end of the camera-tube. At one side of the annular groove is secureda curved plate, I), to which are pivoted two curved arms, 0, which areoppositely arranged with respect to each other, and are provided withnotched ends (I, received between a binding-screw, e, and a plate, f,secured to the back of the shutterbody when the arms 0 are closed aroundthe flange of the cameratube O, as shown in Fig. 2. The opposite orfront side of the shutterbody A has a circular recess, 9, in which isplaced a circular shutter, D, provided with a circumferentially -groovcdboss, 7L, which. is mounted revolubly on a Stud, 17, projecting in theaxis of the shutter-body A from a plate, j, secured to the back of theshutter-body. The shutter D has an opening, 7.", corresponding to theopening B of the shutter'body, and in the periphery of the shutter D areformed the notches Z m.

To an arm, a, secured to the front of the shutter-body, nearitsperiphery, is pivoted a forked lever, E, having the long arm 0 and a.short arm, 0. To the short arm 0 is connected a cord, j), which is wonnd partly around the boss h in the groove thereof, and secured to theboss by passing it through a hole near the edge ofthe boss and tying itin a knot or in any other convenient way. To the arm 0 of the lever E isfitted the slide q of the adjustable weight F. A set-screw, 0', passesthrough the side of the slide q, and clamps it in any required positionon the arm 0. Weight F is preferably made cylindrical in form, and theslide q is attached to the end of the weight nearest the pivot of thelever E,to permit of projecting the opposite end of the weight beyondthe end of the arm 0 when desirable.

To the face of the body A is pivoted a curved lever, G, on the screw s,which lever is provided at one end with an outwardlyprojecting arm, t,and also with an arm, a, projecting into the recess 9 in position toengage the notch Z in the edge of theshutter D. The end of the lever Gon the opposite side of its pivot is provided with an arm, 0, whichprojects into the recess 9 in position to engage the notch min theperiphery of the shutter D. This end of the lever G is also providedwith an arm, 10, projecting outwardly toward the periphery of the bodyA,and on the periphery of the body is placed a curved slotted plate, (0,provided with a finger, I), projecting beyond the face of the shutterand capable of being moved forward opposite the arm 10. The plate a isheld in position on the periphery of the body A by screws c,passingthrough a slot in the body of the plate. The body A is provided with astop-pin, d, forlimiting the 1110 The tion of the lever G when thefinger Z) is with drawn from the path of the arm HOll the lever.

A pneumatic cylinder, II, is supported by a plate, a, secured to theperiphery of the body A, and contains a piston, f, the end of whichtouches the arm 1, carried by the lever G. The \l-shaped spring in,connected with the plate 0 and with the arm I tends to draw the arm I.and the end of the lever G, with which it is connected, toward theperiphery of the body A and in opposition to the outward pressure of thepiston f. The other end of the cylinder ll is connected by a flexibletube, g, with a pneumatic bulb, h.

The shutter l) is provided with a triangular pro ection, 17, and armsjin project from the body A over the shutter l) and in the path of thetriangular projection '1". The arm /.r' is bent outward so as to presentan inclined surface to the triangular projection 1 and thus arrest themotion of the shutter without jarring the camera. The arm is limits theforward motion of the shutter, and the arm j limits the return motion ofthe shutter. To the boss ll is secured an arm, Z, by which the shutteris returned to thcpoint of starting after having been released formaking an exposure. A segmental plate, I, which is secured to the faceof the body A, extends over the upper edge of the shutter D, andprevents the light from passing around the edge of the shutter at thatpoint.

The operation of my improved shutter is as follows: The weight F havingbeen adjusted on the arm 0, so as to secure the desired rapidity ofmotion in the shutter I), the shutter is turned backward, (into theposition shown in full lines in Fig. 1,) winding the cord 1) around theboss 71 of the shutter and bringing the notch in under the end of thelever G,permitting the arm a to drop into the notch,thus holding theshutter in a closed position, with the weight F raised in position toturn the shutter when released. If it is desired to make an instzmeousexposure of the plate, the finger I) is moved forward over the arm 11*,thereby limiting the motion of the lever G- to the amount required torelease the arm '0, carried by the lever from the notch in in theperiphery of the shutter .l), and preventing the arm n from droppinginto the notch 7. Pressure upon the bulb 71/ forces air into the cyliirder ll, which pushes out the piston f and re leases the shutter, so thatit is immediately turned through a part of a revolution by the action ofthe weight it, through the medium of the lever E and the cord p, thuscarrying the opening 7. past the opening l3 and past the end ofthecamera-tube. By moving the weight 1* outward on the arm 0 the rapidityof the exposure is increased.

\Vhen it is desired to make a time exposure, the finger I) is moved awayfrom the path of the arm in, so that when the arm 7*, carried by thelever G, is released from the notch m the arm it, carried by theopposite end of the lever, will be pushed inward into the notch. 7,

so that the motion of the shutter D is arrested when the opening 7.; ol'the shutter coincides with the opening 13 of the shutter-body and withthe opening of the camera-tube. The exposurc continues so long aspressure is created on the piston f by compressing the bulb h; but whenthe bulb h is released the spring in returns the lever (It and piston fto their normal. position, thus releasing the shntterl) and allowing itto be moved forward by the action of the weight F and close the opening.

To provide for holding the shutter permanently open while focusing, orfor a very long exposure, a pin, a, is inserted in a hole in theshutterbody through the notch I.

By means of my im n'ovcment I am enabled to secure a uniform movement ofthe shutter D, which may be easily regulated. by adjusting the weight Fon the arm 0.

It is obvious that the cord 1) may be at tached to the arm 0 of thelever 1* and that the adjustment of the weight F may be effected byreversing it on the army when it is desired to bring the weight near thepivot of the lever E. It also obvious that the opposite end of the cord1 may be secured to some part of the shutter-disk instead. of beingwrapped partly around the boss.

In case it becomes necessary to connect the shutter with the camera-boxindepemlcntly of the camera-tube, the arms 0 and landing-screw 0 will bedispensed with, and other and well known means of fastening will beemployed.

.lEfaving thus described my invention, what I claim as new, and desireto secure by Letters Patent, is

1. The combination, with the oscillating shutter D, provided with thenotches Z in, and the projecting portion intermediate between thenotches, of the lever (l, n'ovidcd with arms 1/, 0, arranged to bereceived in the notches in alternation, the notch lbeing shorter thanthe notch m, as herein specified.

2. The combination, with the shutter D, provided with notches l m, andthe weighted lever E, of thelever (1, provided with the arms a 1* a, andthe plate 0., having the linger b for limiting the motion of the. leverG, sul) stantially as herein shown and described.

I}. The combination, with the shutter I), provided with notches Z in,and the weighted lever E for moving the shutter, of the lever G,provided with arms a o 1/, and the pneumatic cylinder it, having thepiston f arranged to engage the arm I and the V-shaped spring inarranged to oppose the action of the piston f, substantially as shownand described.

it. The combination, with the shutter-body A, provided with the openingll and annular groove a, of arms 0 and means, substantially as shown anddescribed, for clamping the arms in a closed position.

WILLIAM ll. Ll1l\VlS.

Vi tn esses:

Em: .tn Tivrn, Ibnwn. M. CLARK.

